Allah swears to the Greatness of the Qur'an

The usage of La (in Fala) is not an extra character without meaning, as some of the scholars of Tafsir say. Rather it is used at the beginning of an oath when the oath is a negation. This is like when `A'ishah, may Allah be pleased with her said, "La by Allah! Allah's Messenger ﷺ did not touch any woman's hand at all. So in this way, the meaning is, "No! I swear by the Mawaqi` of the stars. The matter is not as you people claim - about the Qur'an - that it is a result of magic or sorcery, rather it is an Honorable Qur'an." Ibn Jarir said, "Some of the scholars of the Arabic language said that the meaning of:

فَلاَ أُقْسِمُ

إِنَّهُ لَقُرْ‌آنٌ كَرِ‌يمٌ فِي كِتَابٍ مَّكْنُونٍ لَّا يَمَسُّهُ إِلَّا الْمُطَهَّرُ‌ونَ (It is surely the Noble Qur'an (recorded already) in a protected book [ i.e. the Preserved Tablet ] that is not touched except by the purified ones [ the angels ]....77-79) Verses [ 75-76] constituted oath and the current set of verses is the subject of the oath jawab-ul-qasam ]. The Qur'an is a noble and glorious Book. The verse refutes the assumption of the pagans that this Book has been forged by a human being or that [ God forbid!] it is a speech inspired by the devil.